mirror of
https://github.com/ApacheThunder/NTR_Launcher.git
synced 2025-06-19 11:35:33 -04:00
24d84286e6
* Overhaul using improved bootloader from NitrohaxTWL. * Alternate bootloader removed as it appears uneeded. * Improved debug output using text instead of colored boxes from NitroHax's original bootloader design. Debug mode will now show enhanced status readouts of cart load process. Text displayed in red if an error occurs (visible even when debug mode is off if error occured)
111 lines
2.7 KiB
C
Executable File
111 lines
2.7 KiB
C
Executable File
/*
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NitroHax -- Cheat tool for the Nintendo DS
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Copyright (C) 2008 Michael "Chishm" Chisholm
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include "encryption.h"
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#include "read_bios.h"
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#define KEYSIZE 0x1048
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static u32 keycode [3];
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static u32 keybuf [KEYSIZE/sizeof(u32)];
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void crypt_64bit_up (u32* ptr) {
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u32 x = ptr[1];
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u32 y = ptr[0];
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u32 z;
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int i;
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for (i = 0; i < 0x10; i++) {
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z = keybuf[i] ^ x;
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x = keybuf[0x012 + ((z>>24)&0xff)];
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x = keybuf[0x112 + ((z>>16)&0xff)] + x;
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x = keybuf[0x212 + ((z>> 8)&0xff)] ^ x;
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x = keybuf[0x312 + ((z>> 0)&0xff)] + x;
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x = y ^ x;
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y = z;
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}
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ptr[0] = x ^ keybuf[0x10];
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ptr[1] = y ^ keybuf[0x11];
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}
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void crypt_64bit_down (u32* ptr) {
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u32 x = ptr[1];
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u32 y = ptr[0];
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u32 z;
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int i;
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for (i = 0x11; i > 0x01; i--) {
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z = keybuf[i] ^ x;
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x = keybuf[0x012 + ((z>>24)&0xff)];
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x = keybuf[0x112 + ((z>>16)&0xff)] + x;
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x = keybuf[0x212 + ((z>> 8)&0xff)] ^ x;
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x = keybuf[0x312 + ((z>> 0)&0xff)] + x;
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x = y ^ x;
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y = z;
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}
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ptr[0] = x ^ keybuf[0x01];
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ptr[1] = y ^ keybuf[0x00];
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}
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static u32 bswap_32bit (u32 in) {
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u8 a,b,c,d;
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a = (u8)((in >> 0) & 0xff);
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b = (u8)((in >> 8) & 0xff);
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c = (u8)((in >> 16) & 0xff);
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d = (u8)((in >> 24) & 0xff);
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u32 out = (a << 24) | (b << 16) | (c << 8) | (d << 0);
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return out;
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}
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void apply_keycode (u32 modulo) {
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u32 scratch[2];
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int i;
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modulo = modulo / sizeof(*keycode);
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crypt_64bit_up (&keycode[1]);
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crypt_64bit_up (&keycode[0]);
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memset (scratch, 0, 8);
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for (i = 0; i < 0x12; i+=1) {
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keybuf[i] = keybuf[i] ^ bswap_32bit (keycode[i % modulo]);
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}
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for (i = 0; i < 0x412; i+=2) {
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crypt_64bit_up (scratch);
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keybuf[i] = scratch[1];
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keybuf[i+1] = scratch[0];
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}
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}
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void init_keycode (u32 idcode, u32 level, u32 modulo) {
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readBios ((u8*)keybuf, 0x30, KEYSIZE);
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keycode[0] = idcode;
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keycode[1] = idcode/2;
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keycode[2] = idcode*2;
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if (level >= 1) apply_keycode (modulo); // first apply (always)
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if (level >= 2) apply_keycode (modulo); // second apply (optional)
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keycode[1] = keycode[1] * 2;
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keycode[2] = keycode[2] / 2;
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if (level >= 3) apply_keycode (modulo); // third apply (optional)
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}
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